RU2763479C2 - Stretchable bandages - Google Patents

Abstract

FIELD: medical products.

SUBSTANCE: wound bandage system contains a stretchable absorbing base with a longitudinally passing axial line, an axial line passing in a transverse direction, and a contour. The absorbing base has the first surface, the second surface and an elasticity module. The second surface is opposite to the first surface. Fixing glue contacts with at least part of the second surface of the absorbing base. A covering layer has an elasticity module. The covering layer is glued to the second surface of the absorbing base by means of fixing glue. The elasticity module of the absorbing base is equal to or less than the elasticity module of the covering layer. The elasticity module is calculated by measuring “stretching” in accordance with a derivative version of ASTM-D882, a standard method for testing the tensile strength of thin plastic sheets (ASTM International, West Conshohocken, Pennsylvania, 2016), using a grip distance of 50 mm and initial deformation speed of 10 mm/mm*min, right after obtaining a load expansion curve, as described in ASTM D882, the elasticity module is determined by tangent to the initial linear part of the load expansion curve, selection of any point along this tangent, and division of stretching stress by corresponding deformation.

EFFECT: providing coating, wound protection and relief in wound healing.

16 cl, 11 dwg

Description

FIELD OF THE INVENTION

The present invention relates to dressings, such as dressings with improved extensibility. The present invention further relates to dressings comprising an absorbent body and a cover layer with improved extensibility.

BACKGROUND OF THE INVENTION

Dressings have been known for some time, for example dressings for applying and/or covering the skin. Such dressings are widely used for covering minor wounds, protecting minor wounds and/or covering abrasions. In some cases, microporous or breathable dressings have been developed and used to cover minor wounds (including partially healed wounds).

While such dressings have been greatly improved over the years, such as by including microporous materials to allow the wound to breathe and allow water vapor to escape from the wound, thus reducing the possibility of wound maceration, there is still a need for dressings with improved extensibility. Accordingly, a wound dressing system of the present invention providing such improved extensibility, comprising an absorbent body and a cover layer attached to the absorbent body with separate areas of fixative adhesive, and/or where the absorbent body has an elastic modulus less than or equal to the elastic modulus of the cover layer. In some embodiments, the wound dressing system further comprises a wound contact layer.

Thus, one aspect of the present invention is to provide wound dressing assemblies that can be used to cover, protect a wound, and to facilitate wound healing. It is also an aspect of the present invention to provide a wound dressing system comprising an absorbent core and a backing layer with improved extensibility. Another aspect of the present invention is to provide a wound dressing system comprising an absorbent body and a cover layer attached to an absorbent body with separate directional area(s) of fixative adhesive. Another aspect of the present invention is to provide a wound dressing system comprising an absorbent body and a cover layer, in which the absorbent body has an elastic modulus not exceeding that of the cover layer. Other aspects of the present invention will become apparent from the following description and claims.

SUMMARY OF THE INVENTION

In one embodiment, the present invention relates to a wound dressing system comprising

a. an extensible absorbent body having a longitudinally extending centerline, a transversely extending centerline, and a contour, wherein the absorbent body has a first surface and a second surface, the second surface being opposed to the first surface;

b. a fixative adhesive in contact with at least a portion of the second surface of the absorbent body;

With. an extensible cover layer adhered to the second surface of the absorbent body with a fixative adhesive such that directional stretching of the cover layer causes a corresponding directional stretching of the second surface of the absorbent body; as well as

d. a wound contact layer that is less extensible than the absorbent body, wherein the wound contact layer is located on the first surface of the absorbent body such that the second surface of the absorbent body is stretched with a corresponding stretch of the cover layer.

In another embodiment, the present invention relates to a wound dressing system comprising:

a. an extensible absorbent body with a longitudinal center line, a transverse center line and a contour, the absorbent body having a first surface, a second surface and a modulus of elasticity, the second surface being opposite the first surface;

b. a fixative adhesive in contact with at least a portion of the second surface of the absorbent body;

With. a cover layer having a modulus of elasticity, wherein the cover layer is adhered to the second surface of the absorbent base by means of a fixative adhesive,

which is characterized in that the modulus of elasticity of the absorbent base does not exceed the modulus of elasticity of the cover layer.

In a further embodiment, the present invention relates to a wound dressing system comprising

a. an absorbent base with a longitudinally extending axial line passing in the transverse direction of the axial line and a contour, while the absorbent base has a first surface and a second surface, the second surface being opposite to the first surface, the second surface having

b. an adhesive contacting a second surface of the absorbent body to form a fixative adhesive region at the center of the second surface of the absorbent body, the fixative adhesive region being contoured;

With. a cover layer adhered to the second surface of the absorbent body by means of a fixing adhesive area, wherein the cover layer has an inner zone at least partially surrounded by an outer zone,

in such a way that the contour of the area of the fixing adhesive defines the inner boundary of the outer surface of the cover layer, while such an outer surface of the cover layer extends from the contour of the fixing adhesive area away from the contour of the fixing adhesive area, outside at least part of the contour of the absorbent bodyone, to the outer zone of the cover layer, for example, the outer surface does not contain or essentially does not contain adhesive.

In another further embodiment, the present invention relates to a wound dressing system comprising

a. an absorbent base with a longitudinally extending axial line, an axial line passing in the transverse direction and a contour, while the absorbent base has a first surface and a second surface, the second surface being opposite to the first surface, the second surface having

b. an adhesive contacting the second surface of the absorbent body to form a fixing adhesive region extending substantially along a transversely extending center line,

With. a cover layer adhered to the second surface of the absorbent base to the fixing adhesive area, the cover layer having an inner zone at least partially surrounded by an outer zone,

wherein the fixative adhesive region has a first side and a second side opposite the first side such that when the fixative adhesive region bonds to the cover layer:

i. the first side defines the end of the first outer surface of the cover layer, extending from the first side, outside the contour of the absorbent body, to the outer zone of the support protective layer in the direction of the axial line extending in the longitudinal direction; and

ii. the second side defines the end of the second outer surface of the cover layer extending from the second side, outside the contour of the absorbent body, to the outer zone of the cover layer in the direction of the longitudinally extending axial line and in the opposite direction to the first outer surface, and the first and second outer surfaces are essentially not contain glue.

BRIEF DESCRIPTION OF GRAPHICS

An embodiment of this invention will now be described in more detail, and by way of illustration only, with reference to the accompanying drawings, in which:

FIG. 1 is a perspective view of an embodiment of a wound dressing system 10' .

FIG. 2 is a plan view of an embodiment of the wound dressing system 10 ' shown in FIG. 1 .

FIG. 3 is a side view of one embodiment of the wound dressing system 10 shown in FIG. 1 .

On theFIG. 4 shows a top view of another embodiment of a wound dressing system10 according to the present invention, demonstrating the position of the fixing adhesive areaWITH throughout the absorbent baseone.

FIG. 5 is a side view of one embodiment of the wound dressing system 10 shown in FIG. 4 showing the area of the fixative adhesive C in contact with the second surface 3 of the absorbent body 1 and the cover layer 5 .

On theFIG. 6 shows a top view of another embodiment from above the wound dressing system10 according to the present invention, demonstrating the fixing adhesive areaWITH in a separate centralized area on the second surface3 absorbent baseone.

On theFIG. 7 presented side view of an embodiment of a wound dressing system10, shown onFIG. 1-3attached to the skin12, and showing the wound contact layer6, absorbent baseonefixing glue4and cover layer5 before stretching the cover layer5.

On theFIG. eight presented side view of an embodiment of a wound dressing system10shown onFIG. 1-3attached to the skin12, and showing the wound contact layer6, absorbent baseonefixing glue4and cover layer5 after stretching the cover layer5.

On theFIG. 8A presented increase in circledFIG. 8A on theFIG. eightshowing stretching of the second surface 3 of the absorbent bodyone when stretching the cover layer5, despite the limited movement of the first surface2absorbent baseone due to its attachment to the less extensible wound contact layer6.

On theFIG.9 shown side view of an embodiment of a wound dressing system10, shown onFIG. 4-5attached to the skin12, and demonstrating the absorbent baseone, fixing adhesive areaWITHand cover layer5 before stretching the cover layer5.

On theFIG. 10 presented side view of an embodiment of a wound dressing system10,shown onFIG. 4-5attached to the skin12,and demonstrating the absorbent frameone, fixing adhesive areaWITHand cover layer5 after stretching the cover layer5.

On theFIG. 10Apresented enlargement of circled FIG. 10Ain FIG. 10, indicating that any stretching of the cover layer5has minimal impact on the absorbent baseone by reducing the contact between the absorbent frameoneand region fixative adhesiveC.

FIG. 11 is an exploded view of an embodiment of the wound dressing system 10 of the present invention, showing the absorbent base 1″ , fixing adhesive 4 and cover layer 5, and optionally the wound contact layer 6 and cover film 7″ .

DETAILED DESCRIPTION OF THE INVENTION

The dressings of the present invention may contain, consist of, or primarily consist of the essential elements and limitations of the invention described herein, as well as any additional or optional features, components, or limitations of the invention described herein.

As used herein, the term "comprising" (and all its grammatical variations) is used in the sense of (and interchangeably with terms) that includes the terms "comprising" or "comprising" and not in the exclusive sense of "comprising only from." In this document, the singular forms are considered to cover both the plural and the singular.

In this document, the terms "skin" and "tissue" are used interchangeably and refer to the skin of a mammal.

All documents incorporated herein in whole or in part by reference are incorporated herein only to the extent that they do not conflict with the present disclosure.

In certain embodiments, the present invention described herein may be practiced in the absence of any component, element (or group of components or elements) or method steps not specifically described herein.

Wound dressing system

Absorbent Base

In some embodiments, the wound dressing system 10 of the present invention comprises an absorbent core 1 with an elastic modulus (calculated as described below) . As shown in FIG. 1 and 3 , the absorbent body 1 has a longitudinally extending center line l and a transversely extending center line t , while the absorbent body 1 has a first longitudinal edge 14 , a second longitudinal edge 15 , each of the first transverse edge 16 and the second transverse edge 17 , individually or in combination, form the contour p . The absorbent body 1 also has a first surface 2' , which is a wound-facing surface, and a second surface 3 (the second surface 3 is opposite the first surface 2' ).

In certain embodiments, the implementation of the absorbent body 1 contains any material that is appropriate, non-irritating to the skin of the user, and capable of absorbing liquid. The absorbent body 1 may be, or be in the form of, a single layer or a multi-layer material, and if it is a multi-layer material, each layer may be the same material or different materials.

Examples of materials that may be suitable for absorbent core 1 include or contain creped cellulose wadding; melt blown polymers; chemically thickened, modified or crosslinked cellulose fibers; the cloth; absorbent foams; absorbent sponges; superabsorbent polymers; absorbent gelling materials; or any other known absorbent material or combinations of any such materials. In some embodiments, the implementation of the absorbent body 1 may be a polymer obtained by electrospinning; nonwoven fabric (i.e. natural or synthetic nonwoven fabric, including fibrous and non-fibrous nonwoven fabrics); woven material; a film (eg, molded film); felt; spunbond; spunlace; hydrowoven material; carded material; needle-punched material; wet-laid fabric or any other suitable material. A more detailed description of materials suitable for forming the absorbent body 1 is provided in US patent No. 9445951B2 and US patent publication No. 20140308867A1, each of which is fully incorporated herein by reference. The absorbent body 1 may further contain minor amounts (typically less than 10%) of non-liquid absorbent materials such as, for example, adhesives, waxes, oils, antimicrobials, active ointments, and the like.

In one embodiment, the absorbent body 1 is or comprises a foam, optionally an open cell foam. The foam may include a synthetic polymer designed to form a suitable open cell foam that absorbs wound exudate. Examples of suitable foam materials include synthetic organic polymers, including but not limited to the following (or selected from the following): Polymer foams can be made from or are a polymer containing one or more types of monomers (e.g., copolymers) or blends ( for example, combinations) of polymers. Examples of foams are described in a book entitled "Flexible Polyurethane Foams", Dow Polyurethanes, editors R. Herrington and K. Hock, 1997.

The foams may have a wide range of thicknesses; for example, from about 0.5 mm or 1 mm to about 3 mm or 10 mm thick. In addition, they may include one or more layers having the desired properties. These layers may be directly bonded to each other or bonded together with adhesive layers. Optionally, the layers located between these layers may be one or more layers of polymer mesh or non-woven material, woven material or knitted fabric to increase the physical integrity of the foam.

In another embodiment, the absorbent body 1 comprises superabsorbent particles or fibers contained in a porous bag. Examples include superabsorbent fibrous webs, which are available from National Nonwovens, Cincinnati, Ohio, or sachets containing superabsorbent material such as Sorbion Sachet S, available from Sorbion AG, Senden, Germany. The superabsorbent particles are also available as AQUA KEEP superabsorbent powder from Sumitomo Seika Chemicals co., ltd. (Osaka, Japan) and HySorb® Super Absorbent Powder from BASF Corporation (Portsmouth, Virginia).

One example of a suitable absorbent body 1 is provided in Delstar (Del.). Non-woven tab based on PET. Other examples include Delstar polyolefin nonwovens and combinations of rayon and polyester or rayon and polyolefin. Suitable designs for an absorbent core are described in US Pat. Nos. 6,838,589; 7030288; and 7612248; which are incorporated herein by reference in their entirety.

In other embodiments, the implementation of the absorbent base 1 contains hydrocolloids.

The hydrocolloid element can be any substance having suitable characteristics for the application, such as but not limited to, for example, sodium carboxymethyl cellulose, pectin, xanthan gum, polysaccharides, sodium or calcium alginates, chitosan, seaweed extract (carrageenan), polyaspartic acid, polyglutamic acid, hyaluronic acid or their salts and derivatives.

Hydrocolloids such as sodium carboxymethyl cellulose and pectin, among others, are agents that form gels upon contact with physiological fluids from a wound. When used in adhesive dressings, these hydrocolloids can be used in combination with elastomers and/or adhesives. In some embodiments, the implementation of the absorbent body 1 containing such hydrocolloids, should provide a moist environment (but without saturation), which is a situation suitable for facilitating healing.

Fixing adhesive

The second surface 3 of the absorbent body 1 is attached to the cover layer 5 by means of a fixing adhesive 4' .

The fixative adhesive 4 is typically a pressure-sensitive fixative adhesive, and in some embodiments may be a pressure-sensitive adhesive used for application to the skin (i.e., causing minimal or no adverse skin effects and being easily removed from the skin). skin with minimal or no discomfort). Accordingly, in some embodiments, the fixative adhesive 4 may be the same as the skin-contact adhesive 8 (described below, including specific examples of suitable skin-contact adhesives). Other suitable locking adhesives are described in US Pat. No. RE 24,906; US patent No. 4737410 (example 31); US patent Nos. 3389827, 4112213, 4310509 and 4323557, each of which is fully incorporated herein by reference.

In certain embodiments, the fixative adhesive 4 is positioned on or in contact with the second surface 3 of the absorbent body 1 to form a continuous or discontinuous layer or outer surface of the fixative adhesive 4' .

In one embodiment, as shown in FIG. 6 , the fixative adhesive 4 is positioned on or in contact with the second surface 3 of the absorbent body 1 to form a region C of the fixative adhesive 4 at or near the center of the second surface 3 of the absorbent body 1 (i.e., at the intersection of the longitudinally extending center line l and the transversely extending centerline t ), in area C of fixing adhesive 4 with contour c .

In another embodiment, as shown in FIG. 4-5 , the fixing adhesive 4 is positioned on or in contact with the second surface 3 of the absorbent body 1 at the center of the second surface 3 of the absorbent body 1 where the longitudinal center line l and the transverse center line t intersect to form a region C of the fixing adhesive 4 , when In this case, the region C can additionally extend longitudinally substantially along the transversely extending center line t , wherein the region C of the fixing adhesive 4 forms a first side C' and a second side C" opposite the first side C' .

The expression "substantially along" in relation to the location of the adhesive area C relative to the transverse centerline t means that the area of the fixing adhesive may have any directional shape or shape, including alignment with, diagonally to, or intersecting (for example, in the case of a sinusoidally intersecting structure) with a transversely passing center line t , provided that the area of the fixing adhesive extends in the general direction of the specified center line. In addition, the first side C' and the second side C" can have any line structure and have the same or different structures .

Cover layer

Wound dressing system10 additionally contains a cover layer5 with front face5' and back surface5" (back surface5" located on the opposite side of the front surface 5'), while the cover layer5 with outdoor areathirteen, inner zoneeleven and contourR, while the inner zoneeleven or partially (as shown inFIG. 4), or completely (as shown inFIG. 6) is surrounded by an outer zonethirteen. Front surface5' cover layer5 attached to the second surface3absorbent baseone with adhesive fixing4(or area C fixative adhesive4)and, in some embodiments, such that the absorbent bodyonelocated inside the inner zoneeleven. In certain embodiments, the front surface5' cover layer5 attached to the second surface3 absorbent baseone with adhesive fixing4, so that the longitudinal tension of the cover layer5 causes a corresponding longitudinal stretching of the second surface3 absorbent baseone. Cover layer5 may include one or more layers (or overlays).

In certain embodiments, the edge of the contour P of the cover layer 5 extends beyond at least a portion of the contour P of the absorbent body 1 so that the cover layer 5 at least partially covers and at least partially extends beyond the absorbent layer 1 for attachment to the wearer's skin. In certain embodiments of the present invention, the edge of the entire contour P of the cover layer 5 extends beyond the entire edge of the contour P of the absorbent body 1 so that the cover layer 5 completely covers and completely extends beyond the absorbent body 1 for attachment to the wearer's skin.

In certain embodiments, the fixing adhesive 4 contacts the front surface 5' of the cover layer 5 to attach the front surface 5' of the cover layer 5 to the second surface 3 of the absorbent body 1' .

In certain embodiments, the area C of the fixative adhesive 4 contacts both i) the second surface 3 of the absorbent body 1 at or near the center (for example, at the intersection of the longitudinal center line l and the transverse center line t ) and ii) the front surface 5' of the cover layer 5 so that the front surface 5' of the cover layer 5 is attached to the second surface 3 of the absorbent body 1 and forms a contour c defining the inner boundary of the outer surface of the cover layer 5 , this outer surface of the cover layer 5 extending from the contour c beyond at least part of the contour p of the absorbent body 1 to the outer zone 13 of the cover layer 5 as shown in FIG. 6 . Such outer surface of the cover layer 5 does not contain or essentially does not contain adhesive.

In one embodiment, as shown in FIG. 4-5 , the region C of the fixing adhesive 4 as described above also extends longitudinally substantially along the transversely extending center line t , with the region C contacting the front surface 5' of the cover layer 5 to attach the front surface 5' of the cover layer 5 to the second surface 3 of the absorbent base 1 so that:

i) the first side C defines the end of the first outer surface of the cover layer extending from the first side C beyond at least part of the contour p of the absorbent body 1 to the outer zone 13 of the cover layer 5 in the direction of the longitudinally extending axial line l , while the first outer surface is limited outer zone 13 ; and

ii) the second side C'' defines the end of the second outer surface of the cover layer extending from the second side, outside the contour of the absorbent body, to the outer zone 13 of the cover layer 5 in the direction of the longitudinal center line and in the opposite direction of the first outer surface , while the second the outer surface is defined by the outer zone 13 , and the first and second outer surfaces are substantially free of adhesive.

As described herein with respect to the outer surfaces of the cover layer 5 that are substantially free of adhesive, the term "substantially free of adhesive" means less than 20%, optionally less than 15%, optionally less than 5%, optionally less than 2.5 % or optionally zero percent of the described outer surface is in contact with or applied to it with any adhesive or compound having adhesive properties.

Without wishing to be bound by any theory, as shown in FIG. 9 - 10A, it is assumed that the locking arrangement in the form of an adhesive area of the fixing glue in the center (e.g., center) and essentially along the transversely extending centerline t, 3 with respect to the second surface of the absorbent body 1, as previously described, minimizes kakoe- or movement or stretching of the absorbent body 1 in connection with movement or stretching of the attached cover layer 5 .

In some embodiments, the modulus of elasticity of the absorbent body 1 does not exceed the modulus of elasticity of the cover layer 5, or the load/force required to stretch the absorbent body 1 for a given percentage change in length, which is equal to or lower than the load/force required to stretch the cover layer with the same percentage change in length. As used herein, the term "elastic modulus" (e.g., of an absorbent body 1 having a cover layer 5) is calculated as follows to obtain "stretch" measurements in accordance with a derived version of ASTM-D882, a standard test method for tensile strength of thin plastic webs ( ASTM International, West Conshohocken, PA, 2016).

ASTM D882-9 originally specified a grip distance of 250 mm and an initial strain rate of 0.1 mm/mm*min. However, in order to obtain measurements for calculating the elastic modulus of the materials of the present invention, a grip distance of 50 mm and an initial strain rate of 10 mm/mm*min are used instead. The modified dimensions and speeds are the same as those used to obtain other tensile properties (eg, tensile strength or elongation at break) of thin plastic films. Once the load expansion curve is obtained, as described in ASTM D882, the elastic modulus is determined by touching the initial linear part of the load expansion curve, picking any point along that tangent, and dividing the tensile stress by the corresponding strain.

An example of a wound dressing system 10 where the modulus of elasticity of the absorbent body 1 is equal to or lower than the modulus of elasticity of the cover layer 5 can be observed in the cases: a) the absorbent body 1 is a non-woven substrate with a basis weight of from about 50 g/cm ² to about 200 g/ cm ² , optionally from about 100 g/cm ² , and is formed from (eg melt-blown) polyurethane filaments (or fibers) with a filament/fiber diameter of from about 50 nm to about 20,000 nm, optionally from about 100 nm to about 10,000 nm, optionally from about 500 nm to about 3000 nm; and b) the cover layer 5 is selected from i) a polyurethane film layer with a thickness of 25 µm to 50 µm; or ii) a polymer-based nonwoven fabric obtained by melt blown spraying with a thickness of 50 µm to 300 µm.

An example of a polyurethane non-woven fabric, nano-filament backing, suitable for an absorbent backing 1 is Nanosan® Sorb/100 from SNS Nano Fiber technology, Hudson, Ohio. Nanosan® Sorb/100. The measured modulus of elasticity in Nanosan® Sorb/100 is 0.2 MPa (or approximately 0.2 MPa). A more detailed discussion of such suitable nanofiber nonwovens can be found in US Pat. No. 4,043,331, which is incorporated herein by reference in its entirety.

The measured modulus of elasticity of the melt sprayed polyurethane nonwoven cover layer 5 is 2.2 MPa (or approximately 2.2 MPa). A wound dressing system with an absorbent body 1 having an elastic modulus equal to or lower than that of the cover layer 5 prevents or reduces the limitation of expansion of the cover layer 5 when attached to the absorbent body 1.

In some embodiments, the modulus of elasticity of the cover layer 5 may range from about 1 MPa to about 50 MPa, or optionally from about 1.5 MPa to about 6 MPa.

In some embodiments, backsheet 5 may comprise a liquid-impermeable, moisture-vapour-permeable polymeric film, although it may optionally include a variety of other materials that are preferably used in combination with a liquid-impermeable, moisture-vapor-permeable polymeric film. The liquid-impermeable, moisture-permeable and vapor-permeable polymeric film is a suitable organic polymeric material that preferably retains its structural integrity in a humid environment. As used herein, "matching" films are those that conform to a surface, even as the surface moves, such as the surface of a body part. Suitable films have a composition and thickness that allow water vapor to pass through. The film helps to control the loss of water vapor from the wound area under the dressing. The film also acts as a barrier to both bacteria and water or other liquids.

Moisture and vapor permeable polymeric films can have a wide range of thicknesses. Preferably they have a thickness of from about 10 microns or 12 microns to 75 microns or 250 microns. In addition, they may include one or more layers having the desired properties. These layers can be co-extruded and/or glued together with a suitable adhesive, for example, if the overall properties of the film and article are met, as described herein.

Examples of suitable materials for liquid-impermeable, moisture-permeable and vapor-permeable polymeric films include synthetic organic polymers, including but not limited to polyurethanes, commercially available from B.F. Goodrich, Cleveland, Ohio, marketed under the trade name ESTANE, including ESTANE 58237 and ESTANE 58245; polyamide block copolymers commercially available from Arkema, King of Prussia, Pa., under the trade designation PEBAX, including PEBAX MV 1074; polyester block copolymers commercially available from DuPont, Wilmington, Del. under the trade designation HYTREL. Polymeric films can be made from one or more types of monomers (eg copolymers) or mixtures (eg combinations) of polymers. An example would be thermoplastic polymers (eg, those that soften when exposed to heat and return to their original state when cooled), such as thermoplastic polyurethane.

The cover layers of the cover layer 5 of the wound dressing systems 10 of the present invention may optionally be other breathable materials, including, for example, non-woven, woven and knitted fabrics, porous films (for example, obtained by perforation or microporous structure) or other known substrates. One such nonwoven web is meltblown polyurethane (for example, available under the tradename MORTHANE PS-440 from Morton International, Seabrook, New Hampshire) or hydrowoven nonwoven polyester or visco-polyester webs (for example, available under the tradename SONTARA 8010 or SONTARA 8411 from DuPont, Wilmington, Del.).

The cover layers of the cover layer 5 may be a combination of a liquid impermeable, moisture and vapor permeable polymeric film and a moisture and vapor permeable nonwoven, woven or knitted fabric or porous film which, among other advantages, impart improved structural integrity and improved aesthetics. properties of the dressings of the present invention. The layers within (or forming) the cover layers are preferably bonded to each other using a layer of suitable adhesive, for example, which may be continuous or discontinuous (for example, such as obtained with a layer of adhesive applied according to the pattern), although other bonding methods, including thermomechanical bonding, such as thermal bonding or ultrasonic bonding.

In some embodiments, the anterior surface cover layer 5 may additionally contact or have a skin-contact adhesive 8 placed thereon for attaching the wound dressing system 10 to the user's skin. In some embodiments, the skin-contacting adhesive 8 contacts or is located on the front surface 5' of the cover layer 5 within the outer zone 13' . In general, any of a variety of pressure-sensitive adhesives can be used as the skin-contacting adhesive 8. In particular, pressure-sensitive adhesives biocompatible with human skin are commonly used for this purpose. In some embodiments, the skin-contacting adhesive 8 may also be either generally water soluble, generally insoluble, or dispersible in an aqueous medium. In certain embodiments, the skin-contacting adhesive 8 may also be either generally insoluble or dispersible in an aqueous medium. Suitable examples include, for example, a commercially available dispersible pressure sensitive adhesive is the adhesive sold under the tradename HL-9415-X from HB Fuller Company. Another acceptable adhesive includes about 10-75% wt. polyalkyloxazoline, 10-75% wt. functional diluent containing a hydroxyl compound or a carboxylic acid compound, and 5-50% wt. tackifier.

Optional Components

Wound contact layer

In some embodiments, the wound contact layer 6 contacts the first surface 2 of the absorbent body 1' . Examples of such wound tissue contact layers 6 include polymeric mesh and porous (eg, perforated) films or other conventional materials that prevent the dressing from sticking to the wound while allowing fluids to penetrate into the absorbent body 1 . In some embodiments, the wound contact layer 6 contacts the absorbent body 1 by direct bonding to the absorbent body 1 (eg, by molding or thermomechanical processing) or by using an adhesive layer.

One example of a suitable layer in contact with the wound grid are high density polyethylene (HDPE), which are available from Delnet Technologies (Del.) Od title Delnet ^® AC530WHT.

In one embodiment, as shown in FIG.7 -8Alayer in contact with the wound6may have a modulus of elasticity that exceeds the modulus of elasticity of the absorbent coreone,so that the wound contact layer6 is less extensible than an absorbent coreone.In such embodiments, the wound contact layer6 attached to the first surface2 absorbent baseone, so that the second surface3 (attached to the front surface5' cover layer5) absorbent baseone stretches (or maintains/maintains stretch for stretching) in the longitudinal direction with a corresponding longitudinal stretch of the cover layer5. Respectively, extensibility of the absorbent coreone is such that when the wound contact layer is attached6 with the characteristics described above to the first surface2 absorbent baseone,second surface3(attached to the front surface5' cover layer5) absorbent baseoneretains (or maintains) its ability to move or stretch longitudinally (for example, in response to the application of an appropriate directional movement or stretch of the attached backing layer5 and his front surfaces5') despite any restriction of movement or stretching of the first surface2 absorbent baseone due to its bonding to the less extensible wound contact layer6.

In some embodiments, the module elasticity of the absorbent baseone 25% less, optionally 50% less, optionally 75% less, or optionally 95% less modulus of elasticity of the wound contact layer6.

Cover film

Cover film 7 can be used to cover any deposited adhesive on absorbent substrate 1 or cover layer 5 . The cover film 7 may be in the form of a single layer or segmented portions of the layer. The cover film 7 may be made from kraft paper, polyethylene, polypropylene, polyester, polystyrene (such as high impact polystyrene), or compositions of any of these materials. In one embodiment, the cover films 7 are coated with protective agents such as fluorochemicals or silicones. For example, US Pat. No. 4,472,480, the disclosure of which is incorporated herein by reference in its entirety, describes low surface energy perfluorochemical films. In one embodiment, the cover films 7 are cover materials based on paper types, polyolefin films, or silicone-coated polyester films. Examples of commercially available silicone coated papers are from Wausau Paper Specialty Products (Rhinelander, Wis.) and Mondi Packaging (Lancaster, Ohio). One suitable release film is 60 by 279 square meters (per 3,000 square feet) SC RLSE D11 442-6001 bleached kraft paper, available from Wausau Paper Specialty Products. Optionally, the cover film 7 may include a tongue that facilitates easy removal of the cover film from the cover layer 5 of the absorbent body 1 of the wound dressing system 10' .

Although specific embodiments of the present invention are shown and described herein, it should be understood that these embodiments are merely illustrative of the many possible specific designs that may be developed by applying the principles of the present invention. Numerous and various other designs may be developed by those skilled in the art in accordance with these principles without departing from the spirit and scope of the present invention. Thus, the scope of the present invention should not be limited to the structures described in this application, but only to the structures described by the claims, and equivalents of these structures.

Embodiments of the present invention

1. A wound dressing system, comprising:

a. an extensible absorbent body having a longitudinally extending centerline, a transversely extending centerline, and a contour, wherein the absorbent body has a first surface and a second surface, the second surface being opposed to the first surface;

b. a fixative adhesive in contact with at least a portion of the second surface of the absorbent body;

With. an extensible cover layer adhered to the second surface of the absorbent body by means of a fixative adhesive such that directional stretching of the cover layer causes a corresponding directional stretching of the second surface of the absorbent body; and

d. a wound contact layer that is less extensible than the absorbent body, wherein the wound contact layer is located on the first surface of the absorbent body such that the second surface of the absorbent body is stretched with a corresponding stretch of the cover layer.

2. The wound dressing system according to embodiment 1, characterized in that the absorbent body is in the form of a single layer or multilayer material.

3. The wound dressing system according to embodiments 1 and/or 2, wherein the absorbent base is creped cellulose wadding; melt blown polymers; chemically thickened, modified or crosslinked cellulose fibers; the cloth; absorbent foams; absorbent sponges; superabsorbent polymers; absorbent gelling materials; or combinations of such materials.

4. The wound dressing system of any one of embodiments 1-3, wherein the absorbent base is an electrospun sheet; nonwoven material; woven material; film; felt; spunbond; spunlace; hydrowoven material; carded material; needle-punched material; wet-laid fabric, or any other suitable material.

5. The wound dressing system of any one of embodiments 1-4, wherein the absorbent core is a foam.

6. The wound dressing system of any one of embodiments 1-5, wherein the foam is a polymer containing one or more types of monomers or a combination of polymers.

7. The wound dressing system of any one of embodiments 1-6 wherein the foam is an open cell foam.

8. The wound dressing system of any one of embodiments 1-7, wherein the foam is an open cell synthetic organic foam polymer selected from polyurethanes, carboxylated styrene butadiene rubbers, polyesters, polyacrylates, or mixtures thereof.

9. The wound dressing system of any one of embodiments 1-8 wherein the absorbent base is hydrocolloids.

10. The wound dressing system of any one of embodiments 1-9 wherein the hydrocolloids are selected from sodium carboxymethyl cellulose, pectin, xanthan gum, polysaccharides, sodium or calcium alginates, chitosan, seaweed extract (carrageenan), polyaspartic acid, polyglutamic acid, hyaluronic acids or their salts and derivatives and mixtures thereof.

11. The wound dressing system of any one of embodiments 1-10, wherein the fixative adhesive contacts the second surface of the absorbent body to form a continuous or discontinuous layer of the outer surface of the fixative adhesive.

12. The wound dressing system of any one of embodiments 1-11, wherein the cover layer is contoured such that the contour of the cover layer extends beyond at least a portion of the contour of the absorbent body.

13. A wound dressing system, comprising:

d. an extensible absorbent body having a longitudinally extending centerline, a transversely extending centerline, and a contour, wherein the absorbent body has a first surface, a second surface, and a modulus of elasticity, the second surface being opposed to the first surface;

e. a fixative adhesive in contact with at least a portion of the second surface of the absorbent body;

f. a cover layer having a modulus of elasticity, wherein the cover layer is adhered to the second surface of the absorbent body by means of a fixative adhesive

in which the modulus of elasticity of the absorbent base does not exceed the modulus of elasticity of the cover layer.

14. The wound dressing system of embodiment 13 wherein the modulus of elasticity of the cover layer is from about 1 MPa to about 50 MPa.

15. The wound dressing system of embodiments 13 and/or 14 wherein the modulus of elasticity of the cover layer is from about 1.5 MPa to about 6 MPa.

16. The wound dressing system of any one of embodiments 13-15, or combinations thereof, wherein the absorbent backing is a nonwoven backing having a basis weight of from about 50 g/m2 to about 200 g/cm2 and formed from polyurethane filaments having a diameter filaments from about 500 nm to about 3000 nm.

17. The wound dressing system of any one of embodiments 13-16, wherein the cover layer is selected from i) a polyurethane film layer with a thickness of 25 µm to 50 µm; or ii) a polymer-based nonwoven fabric obtained by melt blown spraying with a thickness of 50 µm to 300 µm.

18. The wound dressing system of any one of embodiments 13-17, wherein the absorbent body is in the form of a single layer or multilayer material.

19. The wound dressing system of any one of embodiments 13-18, wherein the absorbent base is creped cellulose wadding; melt blown polymers; chemically thickened, modified or crosslinked cellulose fibers; the cloth; absorbent foams; absorbent sponges; superabsorbent polymers; absorbent gelling materials; or combinations of such materials.

20. The wound dressing system of any one of embodiments 13-19, wherein the absorbent base is an electrospun sheet; nonwoven material; woven material; film; felt; spunbond; spunlace; hydrowoven material; carded material; needle-punched material; wet-laid fabric, or any other suitable material.

21. The wound dressing system of any one of embodiments 13-20, or combinations thereof, wherein the absorbent core is a foam.

22. The wound dressing system of any one of embodiments 13-21, or combinations thereof, wherein the foam is a polymer containing one or more types of monomers or a combination of polymers.

23. The wound dressing system of any one of embodiments 13-22, or combinations thereof, wherein the foam is an open cell foam.

24. The wound dressing system of any one of embodiments 13-23, wherein the foam is an open cell synthetic organic foam polymer selected from polyurethanes, carboxylated styrene butadiene rubbers, polyesters, polyacrylates, or mixtures thereof.

25. The wound dressing system of any one of embodiments 13-24, or combinations thereof, wherein the absorbent base is hydrocolloids.

26. The wound dressing system of any one of embodiments 13-25, or a combination thereof, wherein the hydrocolloids are selected from sodium carboxymethyl cellulose, pectin, xanthan gum, polysaccharides, sodium or calcium alginates, chitosan, seaweed extract (carrageenan), polyaspartic acid, polyglutamic acid, hyaluronic acid or their salts and derivatives and mixtures thereof.

27. The wound dressing system of any one of embodiments 13-26, or combinations thereof, wherein the fixative adhesive contacts the second surface of the absorbent body to form a continuous or discontinuous layer of the outer surface of the fixative adhesive.

28. The wound dressing system of any one of embodiments 13-27, or combinations thereof, wherein the cover layer is contoured such that the contour of the cover layer extends beyond at least a portion of the contour of the absorbent body.

29. A wound dressing system, comprising:

b. an absorbent body having a longitudinally extending center line, a transversely passing center line and a periphery, the absorbent body having a first surface and a second surface, the second surface being opposite the first surface, the second surface having

d. an adhesive contacting a second surface of the absorbent body to form a fixative adhesive region at the center of the second surface of the absorbent body, the fixative adhesive region being contoured;

e. a cover layer attached to the second surface of the absorbent body by means of a fixing adhesive area, wherein the cover layer has an inner zone at least partially surrounded by an outer zone,

so that the contour of the area of the fixing adhesive defines the inner boundary of the outer surface of the cover layer, while such an outer surface of the cover layer extends from the contour of the fixing adhesive area in the direction from the contour of the fixing adhesive area beyond at least part of the contour of the absorbent bodyone, to the outer zone of the cover layer, and such an outer surface does not contain or essentially does not contain glue.

30. The wound dressing system of Embodiment 29 wherein the fixative adhesive area is continuous.

31. The wound dressing system of embodiment 29 and/or 30 wherein the area of fixative adhesive is discontinuous.

32. The wound dressing system of any one of embodiments 29-31, or combinations thereof, wherein the absorbent body is in the form of a single layer or multilayer material.

33. The wound dressing system of any one of embodiments 29-32, or combinations thereof, wherein the absorbent base is creped cellulose wadding; melt blown polymers; chemically thickened, modified or crosslinked cellulose fibers; the cloth; absorbent foams; absorbent sponges; superabsorbent polymers; absorbent gelling materials; or combinations of such materials.

34. The wound dressing system of any one of embodiments 29-33, or combinations thereof, wherein the absorbent base is an electrospun sheet; nonwoven material; woven material; film; felt; spunbond; spunlace; hydrowoven material; carded material; needle-punched material; wet-laid fabric, or any other suitable material.

35. The wound dressing system of any one of embodiments 29-34, or combinations thereof, wherein the absorbent core is a foam;

36. The wound dressing system of any one of embodiments 29-35, or combinations thereof, wherein the foam is a polymer containing one or more types of monomers or a combination of polymers.

37. The wound dressing system of any one of embodiments 29-36, or combinations thereof, wherein the foam is an open cell foam.

38. The wound dressing system of any one of embodiments 29-37, wherein the foam is an open cell synthetic organic foam polymer selected from polyurethanes, carboxylated styrene butadiene rubbers, polyesters, polyacrylates, or mixtures thereof.

39. The wound dressing system of any one of embodiments 29-38, wherein the absorbent base is hydrocolloids.

40. The wound dressing system of any one of embodiments 29-39, or a combination thereof, wherein the hydrocolloids are selected from sodium carboxymethyl cellulose, pectin, xanthan gum, polysaccharides, sodium or calcium alginates, chitosan, seaweed extract (carrageenan), polyaspartic acid, polyglutamic acid, hyaluronic acid or their salts and derivatives and mixtures thereof.

41. The wound dressing system of any one of embodiments 29-40, or combinations thereof, wherein the fixative adhesive contacts the second surface of the absorbent body to form a continuous or discontinuous layer of the outer surface of the fixative adhesive.

42. The wound dressing system of any one of embodiments 29-41, or combinations thereof, wherein the cover layer is contoured such that the contour of the cover layer extends beyond at least a portion of the contour of the absorbent body.

43. A wound dressing system, comprising:

b. an absorbent body having a longitudinally extending center line, a transversely passing center line and a periphery, wherein the absorbent body has a first surface and a second surface, the second surface being opposite to the first surface, the second surface having:

d. an adhesive in contact with the second surface of the absorbent body to form a fixative adhesive region extending substantially along a transversely extending center line,

e. a cover layer attached to the second surface of the absorbent body by means of a fixing adhesive area, wherein the cover layer has an inner zone at least partially surrounded by an outer zone,

moreover, the fixative adhesive area has a first side and a second side opposite the first side, so that if the fixative adhesive area contacts the protective layer, then:

i. the first side forms the end of the first outer surface of the cover layer extending from the first side beyond the contour of the absorbent body to the outer area of the cover layer in the direction of the longitudinally extending axial line; and

ii. the second side defines the end of the second outer surface of the cover layer extending from the second side, outside the contour of the absorbent body, to the outer zone of the cover layer in the direction of the longitudinally extending axial line and in the opposite direction to the first outer surface, and the first and second outer surfaces are essentially not contain glue.

44. The wound dressing system of Embodiment 43 wherein the fixative adhesive area is continuous.

45. The wound dressing system of embodiments 43 and/or 44 wherein the area of fixative adhesive is discontinuous.

46. The wound dressing system of any one of embodiments 43-45, or combinations thereof, wherein the absorbent body is in the form of a single layer or multilayer material.

47. The wound dressing system of any one of embodiments 43-46, or combinations thereof, wherein the absorbent base is creped cellulose wadding; melt blown polymers; chemically thickened, modified or crosslinked cellulose fibers; the cloth; absorbent foams; absorbent sponges; superabsorbent polymers; absorbent gelling materials; or combinations of such materials.

48. The wound dressing system of any one of embodiments 43-47, or combinations thereof, wherein the absorbent base is an electrospun sheet; nonwoven material; woven material; film; felt; spunbond; spunlace; hydrowoven material; carded material; needle-punched material; wet-laid fabric, or any other suitable material.

49. The wound dressing system of any one of embodiments 43-48, or combinations thereof, wherein the absorbent core is a foam.

50. The wound dressing system of any one of embodiments 43-49, or combinations thereof, wherein the foam is a polymer containing one or more types of monomers or a combination of polymers.

51. The wound dressing system of any one of embodiments 43-50, or combinations thereof, wherein the foam is an open cell foam.

52. The wound dressing system of any one of embodiments 43-51, or combinations thereof, wherein the foam is an open cell synthetic organic foam polymer selected from polyurethanes, carboxylated styrene butadiene rubbers, polyesters, polyacrylates, or mixtures thereof.

53. The wound dressing system of any one of embodiments 43-52, or combinations thereof, wherein the absorbent base is hydrocolloids.

54. The wound dressing system of any one of embodiments 43-53, or a combination thereof, wherein the hydrocolloids are selected from sodium carboxymethyl cellulose, pectin, xanthan gum, polysaccharides, sodium or calcium alginates, chitosan, seaweed extract (carrageenan), polyaspartic acid, polyglutamic acid, hyaluronic acid or their salts and derivatives and mixtures thereof.

55. The wound dressing system of any one of embodiments 43-54, or combinations thereof, wherein the fixative adhesive contacts the second surface of the absorbent body to form a continuous or discontinuous layer of the outer surface of the fixative adhesive.

56. The wound dressing system of any one of embodiments 43-55, or combinations thereof, wherein the cover layer is contoured such that the contour of the cover layer extends beyond at least a portion of the contour of the absorbent body.

Claims (21)

1. Wound dressing system (10), containing: a. an extensible absorbent base (1) with a longitudinally passing axial line (1), an axial line passing in the transverse direction and a contour, while the absorbent base has a first surface (2), a second surface (3) and an elastic modulus, the second surface being opposite to the first surface ; b. a fixative adhesive (4) in contact with at least a portion of the second surface of the absorbent body; With. a cover layer (5) having an elastic modulus, wherein the cover layer adhered to the second surface of the absorbent base by means of a fixative adhesive, characterized in that the modulus of elasticity of the absorbent base is equal to or less than the modulus of elasticity of the cover layer, where modulus of elasticity is calculated by measuring "stretch" according to a derivative version of ASTM-D882, Standard Test Method for Tensile Strength of Thin Plastic Webs (ASTM International, West Conshohocken, PA, 2016), using a grip distance of 50 mm and an initial strain rate of 10 mm/mm*min, immediately after obtaining the load expansion curve as described in ASTM D882, the elastic modulus is determined by touching the initial linear portion of the load expansion curve, selecting any point along that tangent, and dividing the tensile stress by the corresponding strain. 2. The wound dressing system (10) of claim 1, wherein the modulus of elasticity of the cover layer (5) is from about 1 MPa to about 50 MPa. 3. The wound dressing system (10) according to claim 1 and/or 2, wherein the elastic modulus of the cover layer (5) is from about 1.5 MPa to about 6 MPa. 4. System wound dressing (10) according to any one of paragraphs. 1-3 or combinations thereof, in which the cover layer (5) is selected from i) a polyurethane film layer with a thickness of 25 µm to 50 µm; or ii) non-woven material based on meltblown polyurethane with a thickness of 50 µm to 300 µm. 5. The wound dressing system (10) according to any one of the preceding claims, wherein the absorbent body (1) is in the form of a single or multilayer material. 6. The wound dressing system (10) according to any one of the preceding claims, wherein the absorbent backing (1) is a non-woven backing having a basis weight of from about 50 g/m ² to about 200 g/cm ² and formed from polyurethane filaments having a filament diameter from about 500 nm to about 3000 nm. 7. System wound dressing according to any one of paragraphs. 1-5, in which the absorbent base (1) is a creped cellulose wadding; melt blown polymers; chemically thickened, modified or crosslinked cellulose fibers; the cloth; absorbent foams; absorbent sponges; superabsorbent polymers; absorbent gelling materials; or combinations of such materials. 8. System wound dressing (10) according to any one of paragraphs. 1-5 or 7, in which the absorbent base (1) is a web obtained by electrospinning; nonwoven material; woven material; film; felt; spunbond; spunlace; hydrowoven material; carded material; needle-punched material; wet-laid fabric, or any other suitable material. 9. System wound dressing (10) according to any one of paragraphs. 1-5, 7 or 8, in which the absorbent base (1) is a foam. 10. The wound dressing system (10) according to claim 9, wherein the foam is a polymer containing one or more types of monomers or a combination of polymers. 11. The wound dressing system (10) according to claim 9 or 10, wherein the foam is an open cell foam. 12. The wound dressing system (10) according to any one of paragraphs. 9-11, or combinations thereof, wherein the foam is an open cell synthetic organic foam polymer selected from polyurethanes, carboxylated styrene butadiene rubbers, polyesters, polyacrylates, or mixtures thereof. 13. System wound dressing (10) according to any one of paragraphs. 1-5 or 7-12, in which the absorbent base (1) is hydrocolloids. 14. The wound dressing system (10) of claim 13 wherein the hydrocolloids are selected from sodium carboxymethyl cellulose, pectin, xanthan gum, polysaccharides, sodium or calcium alginates, chitosan, seaweed extract (carrageenan), polyaspartic acid, polyglutamic acid, hyaluronic acid or their salts and derivatives and mixtures thereof. 15. The wound dressing system (10) according to any one of the preceding claims, wherein the fixative adhesive (4) contacts the second surface (3) of the absorbent body to form a continuous or discontinuous layer of the outer surface of the fixative adhesive. 16. The wound dressing system (10) according to any one of the preceding claims, wherein the cover layer (5) has a contour (P) such that the contour of the cover layer extends beyond at least a portion of the contour (p) of the absorbent body.

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